From cdccc69c62579b0c13b35fad0728079652b8f3c9 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Tue, 31 Jan 2023 11:21:30 +0100 Subject: Move library source into src sub-directory Signed-off-by: David Oberhollenzer --- lib/util/src/hex_decode.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 lib/util/src/hex_decode.c (limited to 'lib/util/src/hex_decode.c') diff --git a/lib/util/src/hex_decode.c b/lib/util/src/hex_decode.c new file mode 100644 index 0000000..ee4b21c --- /dev/null +++ b/lib/util/src/hex_decode.c @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * hex_decode.h + * + * Copyright (C) 2022 David Oberhollenzer + */ +#include "util/util.h" + +#include + +static sqfs_u8 xdigit(int in) +{ + if (isupper(in)) + return in - 'A' + 10; + if (islower(in)) + return in - 'a' + 10; + return in - '0'; +} + +int hex_decode(const char *in, size_t in_sz, sqfs_u8 *out, size_t out_sz) +{ + while (out_sz > 0 && in_sz >= 2 && + isxdigit(in[0]) && isxdigit(in[1])) { + sqfs_u8 hi = xdigit(*(in++)); + sqfs_u8 lo = xdigit(*(in++)); + + *(out++) = (hi << 4) | lo; + + in_sz -= 2; + --out_sz; + } + + return (in_sz > 0) ? -1 : 0; +} -- cgit v1.2.3